Die holder for wire-drawing benches



Sept. 23. 1 3 c. SIE'GFRIED ,IiIE HOLDER FOR WIRE DRAWING BINGRES Filedlarch 13, 1929 Patented Sept. 23, 1930 UNITED STATES CHARLES srnernrnn,or GENEVA, SWITZERLAND, .essisnoag'ro rnnnns nnneun'r, on GENEVA,SWITZERLAND PATENT oFFIcE THE FIR-M OF LES DIE HOLDER FOR WIRE-DRAWINGIBEN'CHES Application filed March 13, 1929, Serial No. 346,676, and in.Switzerland December 15, 1928.

This invention relates to improvements in cooling means for die-holdersof a wiredrawing bench for very fine wires and consists in giving thedie-holder the shape of a tube closed on every side and into which waterunder pressure is introduced.

It has been known that in order to obtain very high speeds with veryfine wires it is necessary to provide a good cooling of the dies and thewire. This cooling must be intense and must be extended also to thedrawing-rollers. For this purpose the dies and the rollers werefrequently immersed into water where the moving rollers and the movingwire had to care for the moving of the water and for their cooling. Butwith this arrangement the speeds needed for an economical working ofthevery fine wires were not attained.

Now it has been found that in this respect very good results. could beobtained by giving to the die-holder the shape of a tubular chamberhaving small outlet openings into which water under pressure isintroduced. Preferably this tubular chamber is made in two parts onepart being formed as a cover. This cover may be slid over the freelyexposed dies and will partly cover the slits provided for the wires.

The annexed drawing represents as an example a working form of adie-holder for wire-drawing benches according to the present invention.

Fig. 1 shows the general arrangement of the drawing rollers and of thedie-holder.

Fig. 2 is a view of the same parts turned through 90 the die-holderbeing shown partly in secton.

Fig. 3 represents a' top view of the closed die-holder and Fig. 4 showshow it can be held open for introducing the wires.

The leading drawing-roller b is arranged above the idle drawing-roller 0and both rollers are mounted on the frame a represented only in part.The step rollers 12 and 0 are shown here with divergent axes the leadingshaft being horizontal and the idle shaft being inclined. Thisarrangement of stepped rollers which tends to have the wires running upfrom the idle roller against the next higher step of the leading rollerand obliquely to the direction of rotation of the latter roller so as todescribe a spiral thereon in order to prevent a' locally limited wear,is al ready known and does not form any part of this invention. It willnot interfere with the wear of the dies. Between the rollers a dieholder(Z is fixed by the screws e. This dieholder is shaped like a tube closed011 every side and-curved according to the stepped. outline of thedrawing rollers. Its cross-section isbest seen from Fig. 2. The dies 7are placed on supports 9 joined by casting to the inside of the standardand are arranged along a curve which corresponds to the stepped outline.of the drawing-rollers as shown especially in Fig. 3. This die-holder ismade in two parts, a standard 9 and a cover 2', both having a U shapedcross section and fitted together so as to form a closed tubular body.The standard 9 held fast by the framing possesses in its side wallslocated so as to constitute the top and bottom walls the slits itrequired for introducing the wires.

The cover 2' possesses two lateral grooves is into which are slidablyfitting corresponding ledges s of the standard so that the cover may bepushed into the position represented in Fig. 4 in order to open thedie-holder. The die-holder cl communicates by means of an opening Z witha water inlet m in the framing a. The passage way Z is dimensioned sothat its cross section is larger than the sum of all water passages leftpartly open by the slits.

In the closed position, that is the position represented in Fig. 3, thewater is admitted under pressure to the die-holder during the drawingprocess. This water spouts from the diiferent openings left still openand cools the dies and the wires on every side. Further the sprays ofpressure water from the slits will hit the lower drawing-roller as wellas the upper dpawingroller and will take care of the lubricating neededthere.

Instead of having a sliding cover the die holder could also be providedwith a hinged cover.

What I claim as new is:

Improved cooling arrangement in the dieholder of a wire-drawing benchfor very fine wires, comprising a framing, a set of leading drawingrollers and a set of idle drawing rollers. having their axes mounted onsaid framing one above the other, a die-holder forming a closed vesselfixed to said framing between the two sets of drawing rollers andcomprising a curved semi-tubular standard and a semi tubular cover-plateboth of U shaped cross-section and closed at both ends, the first havinga base plate attached to the framing and ledges in its side wallslitting into corresponding grooves of the sec- 0nd and both, when fittedtogether, forniing a closed vessel, slits for receiving the wiresprovided in both side walls of the stand;- ard and arranged in. a curveso as to correspond with the'stepped outline of the drawing rollers,supports cast to the inside of the standard and arranged to maintain thedies registering with the slits, a pressure water supply, apressurewater inlet connected therewith and with the framing andv an orificeprovided in the base plate and registering with said inlet and having across section larger than the sum of the openings formed by said slitsso as to have'water spouts formed directed againstv the adjacent drawingrollers. In testimony whereof I afiix my signature.

CHARLES SIE GFRIED.

